Serial Heating Cables – Flexelec Flextrace SR


  • Designed on demand.
  • Long lengths.
  • Integrity of the cable against chemical agents and external environmental conditions (weather).
  • Connection kits FLEXKIT SR for an easy fit.
  • Nickel-copper braid, for mechanical protection and earthing.
  • Fluoropolymer insulation.
  • Special production on request.

Serial Heating Cables For Trams, Metros & Railway Infrastructures

Dpstar provides serial heating cables, self-regulating heating cables, constant wattage heating cables, and many other heating elements to answer your needs. We understand your requirements and we are specialists in Electrical Heat Tracing solutions and provide reliable systems and solutions. Dpstar is responsible, trustworthy, and accountable you can count on.

FLEXTRACE SR series heating cables are designed to ensure constant temperatures or frost protection for pipelines, metal or non-metal ducts, or circuit lengths that exceed the ratings of constant wattage heating cables. The FLEXTRACE SR technology enables electric heat tracing for circuit lengths up to 4,000 m with a single power supply point. The FLEXTRACE SR system and related connection kits FLEXKIT SR POWER, FLEXKIT SR JUNCTION, and FLEXKIT SR END are UL / CSA certified.

SR and SRHT cables are used when it is required to trace very long stretches, where power supply is available only at one end for example in pits, tunnels, heating tracks, and pipes. Due to their constitution, these heating cables are particularly adapted for frost protection and temperature maintenance in corrosive areas. To ensure that these heating elements enjoy a long service life, we recommend using a control device.


  • Designed according to customer requirements.
  • For very long circuits.
  • Highly corrosion-resistant.
  • Very good resistance to mechanical stress.
  • Connection with specific accessories.
  • Nickel-copper braid, for mechanical protection and earthing.
  • Fluoropolymer insulation.
  • Special production on request.

Resistance characteristics

The table below gives the resistance values in Ohm / m at the nominal voltage and for an ambient temperature of 20 ° C. These values indicate the linear resistance for each conductor. Power supply variations and temperature coefficients may affect the given values. The connection and use of these products are aimed to electrical professionals. Contact our technical service for more information.

Typ Max. linear resistance per conductor at +20°C in Ohms/m
SR1 : 1 conductor
SR2 : 2 conductors
SR3 : 3 conductors


  • Frost protection for long pipelines, metal / non-metal ducts.
  • Heat tracing of tanks and vessels with heating cables.
  • Keep process temperatures constant with heating cables in petrochemical.
  • Freeze protection of tunnel equipment with heating cables.


Heating strand Nickel-Copper or Nickel-Chrome
Dimensions SR1 : Diameter 5 to 8 mm
SR2 : 6×9 to 10×15 mm
SR3 : 6×12 to 10×19 mm
Max. power 40 W/m of cable (UL version)
others contact us
Max. voltage 600 V 1200 V
Permissible surface temperature From – 60°C
to + 200°C
From – 60°C
to + 260°C
Tolerance Resistance ± 10 %
Min. bending radius 6 x the diameter or the thickness
Ingress protection code IP54 to IP67 with our kits


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